Condensed Consolidated Statements of Earnings and Comprehensive Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Condensed Consolidated Statements of Earnings and Comprehensive Earnings
Net premiums earned	$ 168,604	$ 154,553	$ 329,736	$ 298,704
Net investment income	13,982	12,847	27,564	25,733
Net realized investment gains	10,431	3,742	16,932	7,426
Consolidated revenue	193,017	171,142	374,232	331,863
Losses and settlement expenses	73,345	65,607	144,361	127,055
Policy acquisition costs	55,156	51,502	110,207	101,838
Insurance operating expenses	13,534	11,885	26,067	24,454
Interest expense on debt	1,874	1,513	3,725	3,025
General corporate expenses	2,549	1,692	4,747	4,078
Total expenses	146,458	132,199	289,107	260,450
Equity in earnings of unconsolidated investees	5,864	4,633	9,289	8,132
Earnings before income taxes	52,423	43,576	94,414	79,545
Income tax expense	16,698	13,674	29,720	24,796
Net earnings	35,725	29,902	64,694	54,749
Other comprehensive earnings (loss), net of tax	19,934	(33,481)	37,671	(15,928)
Comprehensive earnings (loss)	$ 55,659	$ (3,579)	$ 102,365	$ 38,821
Basic:
Basic net earnings per share (in dollars per share)	$ 0.83	$ 0.70	$ 1.50	$ 1.29
Basic comprehensive earnings (loss) per share (in dollars per share)	$ 1.29	$ (0.08)	$ 2.38	$ 0.91
Diluted:
Diluted net earnings per share (in dollars per share)	$ 0.82	$ 0.69	$ 1.48	$ 1.27
Diluted comprehensive earnings (loss) per share (in dollars per share)	$ 1.27	$ (0.08)	$ 2.34	$ 0.90
Weighted average number of common shares outstanding
Basic (in shares)	43,001	42,628	42,993	42,587
Diluted (in shares)	43,688	43,341	43,669	43,268
Cash dividends paid per common share (in dollars per share)	$ 0.18	$ 0.17	$ 0.35	$ 0.33